Water hardness in Oia
50 mg/L soft
Tap water in Oia is soft: 50 mg/L (2.9 gpg · 2.8 °dH · 5 °fH).
Source: EDEYA labcheck – ΔΕΥΑ Θήρας (2025) · data checked 2026-10-21
Greek utilities report total hardness in mg/L CaCO₃.
Water data
| Total hardness | 50 mg/L |
|---|---|
| Utility | ΔΕΥΑ Θήρας |
How Oia compares
- Tap water in Oia is 79 % softer than the median of the 134 cities we track in Greece (237 mg/L).
- By hardness it ranks 130 of 134 in Greece (1 = hardest); 3 % of these cities have softer water.
- Nearest city with clearly softer water: Emporeio, 13 km away (29 mg/L).
- Nearest city with clearly harder water: Kato Gouves, 126 km away (302 mg/L).
Ranking of the hardest and softest water in Greece →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Oia
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Oia water hard or soft?
It is soft: 50 mg/L as CaCO₃ (2.9 gpg, 2.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Oia safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Greek utilities report total hardness in mg/L CaCO₃.
How many grains per gallon is Oia water?
2.9 gpg, equal to 2.8 °dH, 5 °fH or 50 mg/L calcium carbonate.
What dishwasher salt setting should I use in Oia?
For 50 mg/L (2.8 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Oia?
No. With soft water a softener adds nothing.
Source
Source: EDEYA labcheck – ΔΕΥΑ Θήρας (2025). Method: figure published by the water supplier. EDEYA labcheck – ΔΕΥΑ Θήρας · Outdated figure? Tell us